Psyllium seed husks, also known as ispaghula, isabgol, or psyllium, are portions of the seeds of the plant Plantago ovata, (genus Plantago), a native of India, Bangladesh and Pakistan. They are hygroscopic, which allows them to expand and become mucilaginous.

Psyllium seed husk are indigestible and are a source of soluble dietary fiber. It is a great ingredient for intestinal health. It contains a spongy fibre that reduces appetite, improves digestion and cleanses the system. It helps relieve constipation (take 2 tablespoons p/day). It is also used as a regular dietary supplement to improve and maintain regular GI transit. The inert bulk of the husks helps provide a constant volume of solid material irrespective of other aspects of the diet or any disease condition of the gut.

Other uses include gluten-free baking, where ground psyllium seed husks bind moisture and help make breads less crumbly.

The husks are used whole in their natural state, or dried and chopped or powdered for easier consumption. In either of these forms, one takes them by mixing them with water or another fluid.